﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Form1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.label1.Text = "好好学习天天向上";
        }

        private void Form1_Click(object sender, EventArgs e)
        {
            List<Color> list = new List<Color>();
            list.Add(Color.White);
            list.AddRange(new Color[] {Color.Red,Color.Blue,Color.Pink});
            Random ran = new Random();
            int num = ran.Next(0,4);
            var color = list[num];
            this.BackColor = color;

        }

    }
}
